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Sea urchins or urchins (/ ˈ ɜːr tʃ ɪ n z /) are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 ft; 2,700 fathoms). [1] Their tests (hard shells) are round and spiny, typically from 3 to 10 cm (1 ...
The water vascular system is a series of canals through which fluid moves to help propel the podia of the sea urchin. The fluid that fills the water vascular system is similar to marine water, but also has free wandering cells and organic compounds such as proteins and a high concentration of potassium ions when compared to the surrounding sea ...
Sea urchins tend to be important members of their ecosystems by grazing on other organisms and stabilizing populations. In addition to this, sea urchins play a large role in different economies globally as the urchin themselves and their roe are sold for consumption. [1] The same is true for the species within the genus Echinus. [2]
The water vascular system is a hydraulic system used by echinoderms, such as sea stars and sea urchins, for locomotion, food and waste transportation, and respiration. [1] The system is composed of canals connecting numerous tube feet. Echinoderms move by alternately contracting muscles that force water into the tube feet, causing them to ...
Red sea urchins are notoriously ravenous kelp-eaters and are implicated in devastating kelp beds [4] by forming grazing fronts. The intense grazing pressure exerted by urchins is an important link in a trophic cascade often observed along the west coast of North America in which sea otter predation influences urchin abundance, which in turn ...
Mespilia globulus, the globular sea urchin, sphere sea urchin, or tuxedo urchin (trade name), is a sea urchin occurring in tropical shallow reef habitats. [1] The specific name refers to a small ball or spherule, describing its overall shape/morphology. [1]
Sea urchins like the purple sea urchin have been used for food by the indigenous peoples of California, who ate the yellow egg mass raw. [20] [21] In California, the peak gonad growth season (and therefore peak of edibility) is September–October. [22] Early in the season, the gonads are still growing and the yield will be smaller.
Like other sea urchins, Heterocentrotus mammillatus periodically develops gametes to be released into the water for fertilization and undergoes a rest period in order to resume the cycle again. However, the timing and duration of these cycles varies from urchin to urchin.
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